The cxa_demangle implementation definitely consumes stack aggressively, especially when compiled -O0. I’d definitely recommend an 8MB+ stack for any thread that may wind up demangling arbitrary C++ symbols. The new “fast demangler” is much more conservative with stack space but doesn’t yet support the full name mangling specification, so complex symbols often rely on falling back to cxa_demangle.
Kate Stone k8st...@apple.com <mailto:k8st...@apple.com> Xcode Low Level Tools > On Mar 17, 2016, at 2:19 PM, Greg Clayton via lldb-dev > <lldb-dev@lists.llvm.org> wrote: > > Make stacks bigger when making threads on linux? > >> On Mar 17, 2016, at 1:39 PM, Jeffrey Tan via lldb-dev >> <lldb-dev@lists.llvm.org> wrote: >> >> Seems like the crashes happens because of abi::__cxa_demangle() for mangled >> symbol name " >> _ZNSt9_Any_data9_M_accessIPPZN5folly6fibers12FiberManager16runInMainContextIZN8facebook8memcache15CacheClientImplINS6_17CControllerCommonINS1_7dynamicEEEE11multiOpSyncINS6_11McOperationILi11EEESt6vect". >> >> This is blocking us from releasing our C++ debugging support. Anyone know of >> a quick workaround I can fix it locally? Thanks! >> >> On Thu, Mar 17, 2016 at 12:25 PM, via lldb-dev <lldb-dev@lists.llvm.org> >> wrote: >> Bug ID 26978 >> Summary LLDB stack overflow while dealing with symbols for a process on >> Linux >> Product lldb >> Version 3.8 >> Hardware PC >> OS Linux >> Status NEW >> Severity release blocker >> Priority P >> Component All Bugs >> Assignee lldb-dev@lists.llvm.org >> Reporter jeffrey.fu...@gmail.com >> CC llvm-b...@lists.llvm.org >> Classification Unclassified >> >> While using lldb to attach a process in our company on Linux, lldb segment >> fault with a huge stack(more than 30K stack frames). I assume it crashes >> because of stack overflow. Let me know what additional information you >> needed(I >> have coredump): >> >> #0 0x00007f28ce530819 in d_print_comp (dpi=0x7f28c2728c00, options=17, >> dc=0x7f28c2724b80) at cp-demangle.c:4286 >> #1 0x00007f28ce5321e6 in d_print_comp (dpi=0x7f28c2728c00, options=17, >> dc=0x7f28c2724bb0) at cp-demangle.c:4324 >> #2 0x00007f28ce5321e6 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00, >> options=options@entry=17, dc=0x7f28c2724c10) at cp-demangle.c:4324 >> #3 0x00007f28ce532010 in d_print_comp (dpi=0x7f28c2728c00, options=17, >> dc=0x7f28c2724c70) at cp-demangle.c:4489 >> #4 0x00007f28ce5319c0 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00, >> options=options@entry=17, dc=0x7f28c2724c88) at cp-demangle.c:4923 >> #5 0x00007f28ce532056 in d_print_comp (dpi=0x7f28c2728c00, options=17, >> dc=0x7f28c2724ca0) at cp-demangle.c:4493 >> #6 0x00007f28ce5321e6 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00, >> options=options@entry=17, dc=0x7f28c2724cd0) at cp-demangle.c:4324 >> #7 0x00007f28ce532010 in d_print_comp (dpi=0x7f28c2728c00, options=17, >> dc=0x7f28c2725030) at cp-demangle.c:4489 >> #8 0x00007f28ce535353 in d_print_mod (dpi=dpi@entry=0x7f28c2728c00, >> options=options@entry=17, mod=<optimized out>) at cp-demangle.c:5539 >> #9 0x00007f28ce535dbe in d_print_mod_list (dpi=dpi@entry=0x7f28c2728c00, >> options=options@entry=17, mods=mods@entry=0x7f28c1f2ba30, >> suffix=suffix@entry=0) at cp-demangle.c:5468 >> #10 0x00007f28ce5366a1 in d_print_function_type >> (dpi=dpi@entry=0x7f28c2728c00, >> options=options@entry=17, mods=0x7f28c1f2ba30, dc=0x7f28c2725138) at >> cp-demangle.c:5609 >> #11 0x00007f28ce53110c in d_print_comp (dpi=dpi@entry=0x7f28c2728c00, >> options=options@entry=17, dc=0x7f28c2725138) at cp-demangle.c:4808 >> #12 0x00007f28ce530a01 in d_print_comp (dpi=0x7f28c2728c00, options=17, >> dc=0x7f28c2725150) at cp-demangle.c:4434 >> #13 0x00007f28ce5321e6 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00, >> options=options@entry=17, dc=0x7f28c27251b0) at cp-demangle.c:4324 >> #14 0x00007f28ce5336b3 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00, >> options=options@entry=17, dc=0x7f28c2725108) at cp-demangle.c:4529 >> #15 0x00007f28ce534448 in d_print_comp (dpi=0x7f28c2728c00, >> options=<optimized >> out>, dc=0x7f28c2725270) at cp-demangle.c:4793 >> #16 0x00007f28ce5319c0 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00, >> options=options@entry=17, dc=0x7f28c2725288) at cp-demangle.c:4923 >> #17 0x00007f28ce532056 in d_print_comp (dpi=0x7f28c2728c00, options=17, >> dc=0x7f28c27252a0) at cp-demangle.c:4493 >> #18 0x00007f28ce5321e6 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00, >> options=options@entry=17, dc=0x7f28c27252d0) at cp-demangle.c:4324 >> #19 0x00007f28ce534448 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00, >> options=options@entry=17, dc=0x7f28c2725318) at cp-demangle.c:4793 >> #20 0x00007f28ce530a01 in d_print_comp (dpi=0x7f28c2728c00, options=17, >> dc=0x7f28c2725330) at cp-demangle.c:4434 >> #21 0x00007f28ce5321e6 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00, >> options=options@entry=17, dc=0x7f28c2725390) at cp-demangle.c:4324 >> #22 0x00007f28ce53123b in d_print_comp (dpi=dpi@entry=0x7f28c2728c00, >> options=options@entry=17, dc=0x7f28c27253a8) at cp-demangle.c:4742 >> #23 0x00007f28ce53123b in d_print_comp (dpi=dpi@entry=0x7f28c2728c00, >> options=options@entry=17, dc=0x7f28c27253c0) at cp-demangle.c:4742 >> #24 0x00007f28ce5336b3 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00, >> options=options@entry=17, dc=0x7f28c2725108) at cp-demangle.c:4529 >> #25 0x00007f28ce53123b in d_print_comp (dpi=0x7f28c2728c00, options=17, >> dc=0x7f28c27252e8) at cp-demangle.c:4742 >> #26 0x00007f28ce5319c0 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00, >> options=options@entry=17, dc=0x7f28c2725300) at cp-demangle.c:4923 >> #27 0x00007f28ce5366e1 in d_print_function_type >> (dpi=dpi@entry=0x7f28c2728c00, >> options=options@entry=17, mods=0x7f28c1f2cc70, dc=0x7f28c2725318) at >> cp-demangle.c:5617 >> #28 0x00007f28ce53110c in d_print_comp (dpi=dpi@entry=0x7f28c2728c00, >> options=options@entry=17, dc=0x7f28c2725318) at cp-demangle.c:4808 >> #29 0x00007f28ce530a01 in d_print_comp (dpi=0x7f28c2728c00, options=17, >> dc=0x7f28c2725330) at cp-demangle.c:4434 >> .... >> >> #31767 0x00007f28ce5336b3 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00, >> options=options@entry=17, dc=0x7f28c2725108) at cp-demangle.c:4529 >> #31768 0x00007f28ce53123b in d_print_comp (dpi=dpi@entry=0x7f28c2728c00, >> options=options@entry=17, dc=0x7f28c2725408) at cp-demangle.c:4742 >> #31769 0x00007f28ce534448 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00, >> options=options@entry=17, dc=0x7f28c2725450) at cp-demangle.c:4793 >> #31770 0x00007f28ce530a01 in d_print_comp (dpi=dpi@entry=0x7f28c2728c00, >> options=options@entry=17, dc=dc@entry=0x7f28c2725468) at cp-demangle.c:4434 >> #31771 0x00007f28ce536f53 in d_demangle_callback (options=17, >> opaque=0x7f28c2723cc0, callback=0x7f28ce52c820 >> <d_growable_string_callback_adapter>, dc=0x7f28c2725468) at >> cp-demangle.c:4063 >> #31772 0x00007f28ce536f53 in d_demangle_callback (mangled=<optimized out>, >> mangled@entry=0x0, callback=callback@entry=0x7f28ce52c820 >> <d_growable_string_callback_adapter>, opaque=opaque@entry=0x7f28c2728db0, >> options=17) at cp-demangle.c:5865 >> #31773 0x00007f28ce53709f in __cxa_demangle (options=17, palc=<synthetic >> pointer>, mangled=0x0) at cp-demangle.c:5886 >> >> #31774 0x00007f28ce53709f in __cxa_demangle >> (mangled_name=mangled_name@entry=0x7f28ace3d460 >> "_ZNSt9_Any_data9_M_accessIPPZN5folly6fibers12FiberManager16runInMainContextIZN8facebook8memcache15CacheClientImplINS6_17CControllerCommonINS1_7dynamicEEEE11multiOpSyncINS6_11McOperationILi11EEESt6vect"..., >> output_buffer=output_buffer@entry=0x0, length=length@entry=0x0, >> status=status@entry=0x0) at cp-demangle.c:5950 >> #31775 0x00007f28d015dc57 in >> lldb_private::Mangled::GetDemangledName(lldb::LanguageType) const >> (this=this@entry=0x7f28c0d48310, >> language=language@entry=lldb::eLanguageTypeC_plus_plus) >> at >> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Core/Mangled.cpp:316 >> >> #31776 0x00007f28d025bdca in lldb_private::Symtab::InitNameIndexes() >> (this=0x7f28ac1a8ff0) at >> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Symbol/Symtab.cpp:334 >> #31777 0x00007f28d025d0b8 in >> lldb_private::Symtab::FindAllSymbolsWithNameAndType(lldb_private::ConstString >> const&, lldb::SymbolType, std::vector<unsigned int, std::allocator<unsigned >> int> >&) (this=this@entry=0x7f28ac1a8ff0, name=..., >> symbol_type=symbol_type@entry=lldb::eSymbolTypeAny, symbol_indexes=...) at >> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Symbol/Symtab.cpp:819 >> >> #31778 0x00007f28d0160ec2 in >> lldb_private::Module::FindSymbolsWithNameAndType(lldb_private::ConstString >> const&, lldb::SymbolType, lldb_private::SymbolContextList&) >> (this=0x7f28ac0605a0, name=..., >> symbol_type=symbol_type@entry=lldb::eSymbolTypeAny, sc_list=...) at >> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Core/Module.cpp:1432 >> #31779 0x00007f28d016781d in >> lldb_private::ModuleList::FindSymbolsWithNameAndType(lldb_private::ConstString >> const&, lldb::SymbolType, lldb_private::SymbolContextList&, bool) const >> (this=this@entry=0x7f28c27294b0, name=..., >> symbol_type=symbol_type@entry=lldb::eSymbolTypeAny, sc_list=..., >> append=append@entry=false) at >> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Core/ModuleList.cpp:573 >> #31780 0x00007f28d0514626 in >> JITLoaderGDB::GetSymbolAddress(lldb_private::ModuleList&, >> lldb_private::ConstString const&, lldb::SymbolType) const >> (this=this@entry=0x7f28ac042990, module_list=..., name=..., >> symbol_type=symbol_type@entry=lldb::eSymbolTypeAny) at >> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Plugins/JITLoader/GDB/JITLoaderGDB.cpp:500 >> >> #31781 0x00007f28d05164cb in >> JITLoaderGDB::SetJITBreakpoint(lldb_private::ModuleList&) >> (this=0x7f28ac042990, >> module_list=...) >> at >> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Plugins/JITLoader/GDB/JITLoaderGDB.cpp:177 >> >> #31782 0x00007f28d030c910 in >> lldb_private::JITLoaderList::ModulesDidLoad(lldb_private::ModuleList&) >> (this=<optimized out>, module_list=...) >> at >> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Target/JITLoaderList.cpp:76 >> #31783 0x00007f28d02a90f8 in >> lldb_private::Process::ModulesDidLoad(lldb_private::ModuleList&) >> (this=this@entry=0x894160, module_list=...) >> at >> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Target/Process.cpp:6370 >> ---Type <return> to continue, or q <return> to quit--- >> #31784 0x00007f28d03f3091 in >> lldb_private::process_gdb_remote::ProcessGDBRemote::ModulesDidLoad(lldb_private::ModuleList&) >> (this=0x894160, module_list=...) >> at >> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp:4927 >> #31785 0x00007f28d02d3131 in >> lldb_private::Target::ModulesDidLoad(lldb_private::ModuleList&) >> (this=0x88f8b0, >> module_list=...) >> at >> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Target/Target.cpp:1400 >> #31786 0x00007f28d02dcb58 in >> lldb_private::Target::ModuleAdded(lldb_private::ModuleList const&, >> std::shared_ptr<lldb_private::Module> const&) (this=0x88f8b0, >> module_list=..., >> module_sp=...) >> at >> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Target/Target.cpp:1364 >> #31787 0x00007f28d0168f28 in >> lldb_private::ModuleList::AppendImpl(std::shared_ptr<lldb_private::Module> >> const&, bool) (this=0x88fbb0, module_sp=..., >> use_notifier=use_notifier@entry=true) >> at >> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Core/ModuleList.cpp:110 >> #31788 0x00007f28d0168f6a in >> lldb_private::ModuleList::Append(std::shared_ptr<lldb_private::Module> >> const&) >> (this=<optimized out>, module_sp=...) >> at >> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Core/ModuleList.cpp:117 >> #31789 0x00007f28d02d1def in >> lldb_private::Target::GetSharedModule(lldb_private::ModuleSpec const&, >> lldb_private::Error*) (this=this@entry=0x88f8b0, module_spec=..., >> error_ptr=error_ptr@entry=0x0) >> at >> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Target/Target.cpp:1924 >> #31790 0x00007f28d0620b48 in >> lldb_private::DynamicLoader::LoadModuleAtAddress(lldb_private::FileSpec >> const&, >> unsigned long, unsigned long, bool) (this=<optimized out>, file=..., >> link_map_addr=139710961516544, base_addr=139710941827072, >> base_addr_is_offset=<optimized out>) at >> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Core/DynamicLoader.cpp:192 >> #31791 0x00007f28d038764a in DynamicLoaderPOSIXDYLD::LoadAllCurrentModules() >> (this=0x7f28ac038570) >> at >> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Plugins/DynamicLoader/POSIX-DYLD/DynamicLoaderPOSIXDYLD.cpp:521 >> #31792 0x00007f28d03898f0 in DynamicLoaderPOSIXDYLD::DidAttach() >> (this=0x7f28ac038570) >> at >> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Plugins/DynamicLoader/POSIX-DYLD/DynamicLoaderPOSIXDYLD.cpp:181 >> #31793 0x00007f28d02a646c in lldb_private::Process::CompleteAttach() >> (this=0x894160) at >> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Target/Process.cpp:3443 >> #31794 0x00007f28d02a7236 in >> lldb_private::Process::AttachCompletionHandler::PerformAction(std::shared_ptr<lldb_private::Event>&) >> (this=0x8b8920, event_sp=...) >> at >> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Target/Process.cpp:3194 >> #31795 0x00007f28d02af98c in >> lldb_private::Process::HandlePrivateEvent(std::shared_ptr<lldb_private::Event>&) >> (this=this@entry=0x894160, event_sp=...) >> at >> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Target/Process.cpp:4184 >> #31796 0x00007f28d02b09bd in >> lldb_private::Process::RunPrivateStateThread(bool) >> (this=0x894160, is_secondary_thread=<optimized out>) >> at >> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Target/Process.cpp:4429 >> #31797 0x00007f28d0108421 in >> lldb_private::HostNativeThreadBase::ThreadCreateTrampoline(void*) >> (arg=0x8b8900) >> at >> /home/engshare/third-party2/lldb/3.8.0.rc3/src/llvm/tools/lldb/source/Host/common/HostNativeThreadBase.cpp:81 >> #31798 0x00007f28cea24aa1 in start_thread () at /lib64/libpthread.so.0 >> #31799 0x00007f28cdd8693d in clone () at /lib64/libc.so.6 >> >> >> You are receiving this mail because: >> • You are the assignee for the bug. >> >> _______________________________________________ >> lldb-dev mailing list >> lldb-dev@lists.llvm.org >> http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev >> >> >> _______________________________________________ >> lldb-dev mailing list >> lldb-dev@lists.llvm.org >> http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev > > _______________________________________________ > lldb-dev mailing list > lldb-dev@lists.llvm.org > http://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-dev
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